I think I have figured out the drain. After much fiddling about with a multimeter and fuses, got the car sleeping and it was still pulling between 3.4n and 2.8n (n being between 0 & 9), eventually found that by pulling fuse 74 (Telephone) the draw dropped down to 0.7n and then after so seconds or so, dropped down to a steady 0.04.

That go me thinking as in the front there is a broken iphone cradle for Bluetooth that has a switch on it. Anyway, know what the electrics where like on this car when I got it (DVD Player wired so constantly on and draining the power), I thought I would check the cradle switch and it was on. Switch off and drain dropped down to 0.04, switched back on and back to between 3.n & 2.n

I guess the kids must have switched it on when playing cars. So, have switched it off, all fuses plugged in and will now see if battery drains within a couple of days. If the battery remains charged, I will look at disconnecting\re-wiring the cradle. If the battery does drain...

At least I hopefully have saved myself a big garage bill.

Is 0.04 an acceptable rate?